Abstract The present study investigated the chemical composition of essential oil extracted from Elsholtzia fruticosa, and evaluated the biological activities of the essential oil and its main components against Ditylenchus destructor. The essential oil of E. fruticosa was obtained by hydrodistillation and analyzed by GC/ MS. Twenty-three components of essential oil were identified. The most abundant compounds were eucalyptol (40.1%), γ-terpinene (15.8%), limonene (9.3%) and β-pinene (5.2%). Essential oil and three major constituents (eucalyptol, γ-terpinene, and limonene) were tested for their biological activities against D. destructor. The results showed that the essential oil, eucalyptol, γ-terpinene, and limonene exhibited a strong effect of suppression against D. destructor (EC50/24h = 0.16, 0.27, 0.36 and 0.23 mg/ml, respectively). The essential oil, eucalyptol, ã-terpinene, and limonene also possessed the obvious nematicidal activities against D. destructor (LC50/24h = 0.18, 0.46, 0.66 and 0.38 mg/ml, respectively). The essential oil and main components described herein merit further study as potential botanical nematicides against D. destructor.

中文翻译：

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香薷地上部分提取精油的化学成分及生物活性研究

摘要 本研究考察了从香薷中提取的精油的化学成分，并评估了精油及其主要成分对破坏链霉菌的生物活性。E. fruticosa 精油是通过水蒸馏获得的，并通过 GC/MS 进行分析。确定了精油的 23 种成分。含量最高的化合物是桉油精 (40.1%)、γ-萜品烯 (15.8%)、柠檬烯 (9.3%) 和 β-蒎烯 (5.2%)。测试了精油和三种主要成分（桉叶油素、γ-萜品烯和柠檬烯）对 D. destructor 的生物活性。结果表明，精油、桉油精、γ-萜品烯和柠檬烯对 D. destructor 表现出很强的抑制作用（EC50/24h 分别为 0.16、0.27、0.36 和 0.23 mg/ml）。精油、桉油精、α-萜品烯和柠檬烯也具有明显的杀线虫活性（LC50/24h 分别为 0.18、0.46、0.66 和 0.38 mg/ml）。本文所述的精油和主要成分作为潜在的植物杀线虫剂对抗 D. destructor 值得进一步研究。